Looks like I got a short chamber

[LRRPF52]

with all the discussion and demands that only SAAMI Grendel Chambered barrels etc one would think if Hornady is producing factory ammo and subscribes to SAAMI standard it is patently clear this particular barrel does not meet SAAMI specs and needs to be fixed by AA and not have the owner produce shorter OAL rounds to fire from the rifle. Maybe LBC 264 is not all that bad of an idea as factory ammo will shoot from barrels so chambered.

You can have the exact same problem with any chamber if the reamer is worn or the chambers were cut short.

I've seen it more often in .223 Wylde and .308 chambers, blowing primers left and right, failure to extract, small base sizer die, etc.

All my SAAMI Grendel barrels are cut correctly. Nothing wrong with the chamber design.

Matter of fact, I can load past mag length with a lot of target bullets without getting the projectiles stuck.